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在项目中要用到，需要实现的效果如下：

1、可遍历1-12个月份。

2、可查看每个月份下对应的照片。

运行效果如下：

实现思路：

一开始打算使用ScrollView嵌套一个LinearLayout，然后add进不同子项，不过这样写代码量会比较多，而且要做子项点击事件处理，逻辑会稍微复杂一点。最后使用了ExpandableListView组件，将数据全部抽离出来，依次填进去就搞好了，十分方便，在此记录一下。

代码步骤：

1、首先是布局文件： newphoto_layout.xml

ExpandableListView eblv_newphoto;        eblv_newphoto = (ExpandableListView) findViewById(R.id.eblv_newphoto);  MyExpandableListAdapter adapter = new MyExpandableListAdapter(data);        eblv_newphoto.setAdapter(adapter);

public class MyExpandableListAdapter implements ExpandableListAdapter {        String[] monthEnames = {"一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"};        List
   
     mdata;        String[] colors = {"#B36AE1","#c62817","#022550",                "#118730","#1167bd","#560809",                "#f4d23e","#56a9f6","#f18f2e",                "#3b214c","#ea5e5b","#72be49"        };        public MyExpandableListAdapter(List
    
      data ) {            this.mdata = data;        }        @Override        public void registerDataSetObserver(DataSetObserver observer) {        }        @Override        public void unregisterDataSetObserver(DataSetObserver observer) {        }        @Override        public int getGroupCount() {            return monthEnames.length;        }        @Override        public int getChildrenCount(int groupPosition) {            int num = 0;            for (int i = 0;i
     
       tempChildlist = new ArrayList<>();            List
      
        resultChildlist = new ArrayList<>();            //得到该月份下所有的PhotoPicture            for (int i = 0;i
       
         resultChildlist = (List
        
         ) getChild(groupPosition,childPosition); if (resultChildlist.size() ==1) { NGImageloadHelper.displayImage(img1,Config.IMG_AUDIO_PATH +resultChildlist.get(0).getPath()); } else if (resultChildlist.size() ==2) { NGImageloadHelper.displayImage(img2,Config.IMG_AUDIO_PATH +resultChildlist.get(1).getPath()); } return item_photorv; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } @Override public boolean areAllItemsEnabled() { return false; } @Override public boolean isEmpty() { return false; } @Override public void onGroupExpanded(int groupPosition) { } @Override public void onGroupCollapsed(int groupPosition) { } @Override public long getCombinedChildId(long groupId, long childId) { return 0; } @Override public long getCombinedGroupId(long groupId) { return 0; } }